[Letter from Daniel W. Kempner to L. F. Black & Co., September 21, 1951], letter, September 21, 1951; (https://texashistory.unt.edu/ark:/67531/metapth1360478/m1/1/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .